integrated dpd for small cell and massive mimo · product marketing manager june 2017. agenda 2 ......
TRANSCRIPT
Integrated DPD for Small Cell and Massive MIMO
Peadar Forbes
Product Marketing Manager
June 2017
Agenda
2
►Background: 4G to 5G Transition
►Small Cell & Massive MIMO Overview
►AD9375 Wideband RF Transceiver With Integrated DPD
►AD9375 Design Resources
►Summary
©2017 Analog Devices, Inc. All rights reserved.
1000x more traffic
10―100x more devices
↓1 millisecond latency
↑10 Gbit/s peak data rates
100 Mbit/s wherever needed
Ultra Connectivity
Capacity
Latency
Energy
consumptionCost
User data rates
Coverage
4G and the transition to 5G
will require ULTRA connectivity...
Mobile data traffic grows @ 40% CAGR*
Building penetration increasingly difficult
Spectrum is scarce & expensive
As Networks migrate from 4G to 5G
operators are challenged to keep pace with the
demand for data & connectivity everywhere
*2016-2022, source: Ericsson Mobility report 2016
Sub 6GHz Small Cell & Massive MIMO
Small Cells & Massive MIMO are key building block technologies to enhance network coverage & capacity
6
Small Cells densify the network to provideenhanced capacity and coverage
Coverage & Capacity
Improvement
Spectrum Re-use
Network Densification
Indoor/Outdoor & Rural
Small Cells
7
Massive MIMO base-stations use beamforming to provide higher data rates and enhanced capacity
5x Capacity Improvement
Spectrum Re-use through Beam-forming
Higher Data Rates
Dense Urban Areas
Massive MIMO
8
8M
6M
4M
2M
2016 2017 2018 2019 2020 2021
Small Cell BTS Forecast
Source: Mobile Experts Apr 2017. Excl Residential Femto
40M
30M
20M
10M
2015 2016 2017 2018 2019 2020 2021
Macro BTS Transceiver Forecast
2T2R 4T4R 8T8R 64T64R 128T128R
4G to 5G migration has started with deployment of Small Cell and Massive MIMO base stations
Source: Mobile Experts Apr 2017
Reduce Radio SWaP to enable increased radio density
Proliferation of band variants and output powers
Time to market pressure
Small Cell & Massive MIMO Radio Design
Challenges
Small Cell & Massive MIMO Systems place pressure on radio Size, Weight & Power
Small Cells
Massive MIMO
Single Band
per system
3 - 4 bands
per system
2T2R or 4T4R64T64R or
128T128R
Massive MIMO radios increase antenna count from 2T2R to 128T128R while minimizing size,
power dissipation, weight and cost
Small Cell radios need to support multiple bands while minimizing impact on
power consumption & size
11
High efficiency Power Amplifiers (PAs) are required to minimize power consumption
12
…. But existing FPGA based DPD algorithms are
inefficient and do not scale with antenna count
Digital Pre-Distortion (DPD) enables the use of High Efficiency Power Amplifiers (PAs)
ACLR and EVM Improvement
Model
DPD
PA-1 PA
Po
we
r O
ut
(dB
m)
Power In (dBm)
DPD AM-AM
Po
we
r O
ut
(dB
m)
Power In (dBm)
PA AM-AM
Po
we
r O
ut
(dB
m)
Power In (dBm)
DPD+PA AM-AM
Observation Path
13
Introducing AD9375
The Predecessor -- AD9371 Introduced in June 2016,
replacing 20 Discrete Parts
2× Receivers
2× Transmitters
1× Obs Receiver
3× LO Gen
1× Clock Gen
5.4
(1
35
mm
)
12 mm × 12 mm BGA
15
Pin compatible with AD9371
► DPD Signal Bandwidth 40MHz
► 3G & 4G Waveforms
► TDD & FDD Operation
► Tuning Range 300MHz – 6GHz
► Integrated Tx & Rx Los
► Tx/Rx QEC, DC Offset, LO Leakage, API Support
► Transmit Closed Loop Gain Control & VSWR Monitor
► 6Gbps JESD204B interface
► Power Consumption: 4.8W @ max bandwidth
► Applications 3G/4G small cell base stations (BTS)
3G/4G massive MIMO/active antenna systems
Receivers
BW: 100MHz
Rx NF: 12.5dB
IIP3: 22dBm
Transmitters
Synthesis BW: 250MHz
Tx Pout: +7dBm
OIP3: 27dBm
Observation Path
BW: 250MHz
2 inputs
Introducing the AD9375The 1st Wideband RF Transceiver with Integrated DPD
16
Reduces DPD power by 90% over FPGA based solutions
Cuts SERDES lanes in half
Requires fewer FPGA resources reducing complexity and cost
Provides ease of use – Tested PA library, API, evaluation kits, customer support
Accelerates time to market with proven Small Cell Radio Reference Design
AD9375 with Integrated DPD Benefits
1
2
3
4
5
17
2 x Rx
FPGA
4 x SERDES lanes
AD9375
2 x Tx +
DPD
Obs Rx
2 x Rx
FPGA
with DPD
8 x SERDES lanes
AD9371
2 x Tx
Obs Rx
Integrated DPD enables Smart System Partition2T2R Example
600mW Power Savings
DPD in FPGA DPD in Transceiver
18
384 x SERDES lanes
19W Power Savings
FPGAAD9371
2 x Tx
Obs Rx
BBIF &
TRx CtrlDPD
FPGAAD9371
2 x Tx
Obs Rx
BBIF &
TRx CtrlDPD
DPD in FPGA
128 x SERDES lanes
FPGAAD9375
DPD in Transceiver
2 x Tx + DPD
Obs Rx
FPGAAD9375
2 x Tx + DPD
Obs Rx
Power & SERDES Lane Savings Scale in 64T64R Massive MIMO
BBIF &
TRx Ctrl
BBIF &
TRx Ctrl
x32 x32
19
Before DPD
-28dBc ACLR
Typical Performance – 20MHz BandwidthLDMOS Doherty PA, 42% drain efficiency, 2.39GHz, 38dBm rms Pout, 20MHz LTE, 7.5dB
PAR
After DPD
-52dBc ACLR
Ref 34 dBm Att 20 dB*
*
*
*
Offset 36.3 dBPOS 34 dBm
1 RM
CLRWR
A
LVL
NOR
3DB
RBW 100 kHz
VBW 1 MHz
SWT 1 s*
Center 2.39 GHz Span 250 MHz25 MHz/
EXT
-60
-50
-40
-30
-20
-10
0
10
20
30
W-CDMA 3GPP FWD
Channel Bandwidth Spacing Lower Upper
Tx Channel 18.015 MHz 31.08 dBm
Adjacent 18.015 MHz 20.000 MHz -29.60 dB -29.68 dB
Alternate 18.015 MHz 40.000 MHz -46.88 dB -47.23 dB
2nd Alt 18.015 MHz 60.000 MHz -56.44 dB -56.45 dB
3rd Alt 18.015 MHz 80.000 MHz -60.70 dB -59.13 dB
POS 34 dBm
Date: 12.APR.2017 15:10:44
Ref 34 dBm Att 20 dB*
*
*
*
Offset 36.3 dBPOS 34 dBm
1 RM
CLRWR
A
LVL
NOR
3DB
RBW 100 kHz
VBW 1 MHz
SWT 1 s*
Center 2.39 GHz Span 250 MHz25 MHz/
EXT
-60
-50
-40
-30
-20
-10
0
10
20
30
W-CDMA 3GPP FWD
Channel Bandwidth Spacing Lower Upper
Tx Channel 18.015 MHz 30.95 dBm
Adjacent 18.015 MHz 20.000 MHz -52.10 dB -52.79 dB
Alternate 18.015 MHz 40.000 MHz -54.08 dB -54.44 dB
2nd Alt 18.015 MHz 60.000 MHz -58.59 dB -57.33 dB
3rd Alt 18.015 MHz 80.000 MHz -60.74 dB -59.08 dB
POS 34 dBm
Date: 12.APR.2017 15:10:17
20
Before DPD
-28dBc ACLR
Typical Performance – 40MHz BandwidthLDMOS Doherty PA, 42% drain efficiency, 2.6GHz, 38dBm rms Pout, 2 x 20MHz LTE, 7.5dB
PAR
Ref 30 dBm Att 10 dB*
*
*
*
Offset 53.6 dBPOS 30 dBm
1 RM
CLRWR
A
LVL
NOR
3DB
RBW 100 kHz
VBW 1 MHz
SWT 1 s*
Center 2.516 GHz Span 187 MHz18.7 MHz/
EXT
-60
-50
-40
-30
-20
-10
0
10
20
Standard: W-CDMA 3GPP FWD
Tx Channels
Ch1 35.10 dBm(Ref)
Ch2 34.87 dBm
Total 38.00 dBm
Lower Upper
dB dB
Adjacent -50.56 -50.22
Alternate -52.14 -51.91
2nd Alt -55.54 -54.83
3rd Alt ----- -----
POS 30 dBm
Date: 8.MAY.2017 11:28:18
Ref 30 dBm Att 10 dB*
*
*
*
Offset 53.6 dBPOS 30 dBm
1 RM
CLRWR
A
LVL
NOR
3DB
RBW 100 kHz
VBW 1 MHz
SWT 1 s*
Center 2.516 GHz Span 187 MHz18.7 MHz/
EXT
-60
-50
-40
-30
-20
-10
0
10
20
Standard: W-CDMA 3GPP FWD
Tx Channels
Ch1 34.74 dBm(Ref)
Ch2 35.53 dBm
Total 38.17 dBm
Lower Upper
dB dB
Adjacent -29.23 -28.68
Alternate -36.51 -35.87
2nd Alt -44.66 -44.85
3rd Alt ----- -----
POS 30 dBm
Date: 8.MAY.2017 11:29:09
After DPD
-50dBc ACLR21
AD9375 Design Resources on RadioVerse
& Small Cell Radio Reference Design
22
Launched RadioVerse to help customers
solve complex radio challenges
Market-leading ADI radio technologies
Ecosystem of tools, documentation, reference designs, modules
Best of breed partners
Market specific insights, support, ideas for roadmap planning
AD9375 Design Resources on RadioVerse
Please visit analog.com/RadioVerse-DPD for more
information24
Evaluation Kits► ADRV9375-N/PCBZ with SKY66297 PA evaluation
card
Carrier Platforms ► Xilinx ZC706 (order separately)
Simulation Tools► MATLAB® Filter Wizard
► MathWorks Simulink® Model
Software Driver and
GUI
► DPD GUI
► Windows GUI
► API
Customer Support
Forum
► ADI EngineerZone®—wideband RF transceivers,
API, Linux® drivers, FPGA reference designs
Reference Designs
and Partners
► Small cell radio reference design
► Tested PA reports in collaboration with PA vendors
Tested PA Reports
► Accelerate customer time to market with ready-to-go
PA & DPD solutions
► Selection of PAs tested and optimized for
performance with AD9375 DPD
► Complete Reports detail linearization performance
before and after DPD, efficiency across frequency
and output power
► All PA and DPD settings captured for ease of use
25
In Collaboration with Key Power Amplifier Vendors
Visit analog.com/RadioVerse-DPD for more
information
Introducing Small Cell Radio Reference Design with DPD
26
► Complete JESD204B to antenna design
► 2 × 2 LTE 20 MHz, 250 mW output power per antenna
► BOM reconfigurable to other bands
► Contains all components: transceivers, PAs, LNAs,
filters, power solution
► Small form factor—88 mm × 83 mm
► Get to market faster with a proven reference design
for small cell radios
► Enhance R&D efficiency with a common platform
design easily reconfigured to other bands
► Lowest power, smallest form factor 250 mW small
cell radio available on the market
Key Benefits
1
AD9375LNA
PAADL5355 VGA
+24dBm
250mW
FPGA
LNA
PA
+24dBm
250mW
JESD204B
Small Cell Radio Reference Design
ADP5054 Power Solution
ADL5355 VGA
AD9375 250mW Small Radio Cell Reference Design
27
► Single 5 V supply
► Low power: <10 W total power consumption
► ACLR <–54 dBc typ @ 24 dBm POUT
► Broadband design
LTE band 7 FDD design
BOM reconfigurable to other 3GPP bands:
High efficiency PA SKY66279 (29% PAE)
► Interfaces to Xilinx® ZC706 motherboard via
interposer
visit analog.com/RadioVerse-DPD for more
information
-54dBc
ACLR
Summary
► The transition from 4G to 5G technology is underway
Small Cell and Massive MIMO are the key building blocks enabling enhanced capacity and coverage
► Small Cell & Massive MIMO solutions introduce challenges for the radio designer
Reduce Radio Size Weight & Power to enable increased Radio density
Proliferation of band variants and output powers
Time to market pressure
►AD9375 launch targeting Small Cell & Massive MIMO markets First wideband RF transceiver with integrated DPD
Enables disruptive system partition reducing radio size, weight & power
Wide RF tuning range enables common platform
Complete ecosystem of PA reports, evaluation tools and a small cell radio reference design to accelerate
time to market
28
Thank You For Watching!
For More Information, visit
www.analog.com/RadioVerse-DPD
View Additional Webcasts at
www.analog.com/Webcasts
Ask Questions on EngineerZone
ez.analog.com/Webcasts
Search for ADI Parts on Arrow
www.arrow.com
29